Nozzle assembly for a high-pressure cleaning device

Abstract

In order to achieve a particularly simple construction which is, in particular, easy to assemble in the case of a nozzle assembly for a high-pressure cleaning device with a low-pressure nozzle, a high-pressure nozzle arranged in it, a spray lance which bears a sealing pipe connection insertable into the high-pressure nozzle, a bypass surrounding the high-pressure nozzle and leading to the low-pressure nozzle and displacement elements which alter the distance between the sealing pipe connection and the high-pressure nozzle in such a manner that the sealing pipe connection abuts sealingly on the high-pressure nozzle in a high-pressure position and, as a result, interrupts the connection from the spray lance to the bypass whereas, in a low-pressure position, the sealing pipe connection is at a distance from the high-pressure nozzle and, as a result, releases the connection from the spray lance to the bypass, it is suggested that the spray lance bear a pot-shaped housing which surrounds the sealing pipe connection and in which the low-pressure nozzle and the high-pressure nozzle are mounted so as to be freely displaceable and sealed in relation to the inner wall of the housing and that the displacement elements displace the low-pressure nozzle and the high-pressure nozzle in the housing in its longitudinal direction towards the sealing pipe connection and away from it.

1. Nozzle assembly for a high-pressure cleaning device, comprising:
 a low-pressure nozzle, 
 a high-pressure nozzle arranged within the low pressure nozzle, 
 a spray lance having a first end adapted for connection to a supply line and a second end bearing a sealing pipe connection insertable into the high-pressure nozzle, 
 a bypass bypassing the high-pressure nozzle and leading to the low-pressure nozzle, 
 a pot-shaped housing arranged on the second end of the spray lance and surrounding the sealing pipe connection, and 
 displacement elements displaceable to alter the distance between the sealing pipe connection and the high-pressure nozzle to provide a high-pressure position in which the sealing pipe connection abuts sealingly on the high-pressure nozzle and interrupts a connection between the spray lance and the bypass and a low-pressure position in which the sealing pipe connection is at a distance from the high-pressure nozzle and establishes the connection between the spray lance and the bypass, 
 the low-pressure nozzle and the high-pressure nozzle being mounted in said pot-shaped housing so as to be freely displaceable and sealed in relation to an inner wall of the pot-shaped housing, 
 wherein; 
 the displacement elements displace the low-pressure nozzle and the high-pressure nozzle in the housing in a longitudinal direction of the housing towards the sealing pipe connection in the high-pressure position and away from the sealing pipe connection in the low-pressure position, 
 the high-pressure nozzle is pushable into an interior of the low-pressure nozzle from a rear side, 
 stop elements are provided, said stop elements limiting a depth of insertion of the high-pressure nozzle into the low-pressure nozzle, and 
 the bypass comprises longitudinal channels formed between an inner wall of the interior of the low-pressure nozzle an outer wall of the inserted high-pressure nozzle. 
 
   
   
     2. Nozzle assembly as defined in  claim 1 , wherein the low-pressure nozzle is secured against rotation about a longitudinal axis of the housing by means of an element preventing rotation. 
   
   
     3. Nozzle assembly as defined in  claim 1 , wherein the displacement elements comprise a sleeve surrounding the pot-shaped housing, said sleeve being displaceable in an axial direction on the housing and bearing a stop surface adapted for pushing the low-pressure nozzle into the housing to a greater or lesser depth. 
   
   
     4. Nozzle assembly as defined in  claim 3 , wherein the sleeve is mounted on the housing so as to be rotatable via a thread. 
   
   
     5. Nozzle assembly as defined in  claim 3 , wherein:
 the high-pressure nozzle is pushable into an interior of the low-pressure nozzle from a rear side, and 
 stop elements are provided, said stop elements limiting a depth of insertion of the high-pressure nozzle into the low-pressure nozzle. 
 
   
   
     6. Nozzle assembly as defined in  claim 3 , wherein in the high-pressure position the sealing pipe connection abuts on a sealing surface of the high-pressure nozzle surrounding the sealing pipe connection with an annular sealing section, said sealing section being expandable elastically due to an effect of a pressure of liquid conveyed and being pressed sealingly against the surrounding sealing surface. 
   
   
     7. Nozzle assembly as defined in  claim 1 , wherein the longitudinal channels are in communication with an interior of the pot-shaped housing via lateral openings in the wall of the low-pressure nozzle. 
   
   
     8. Nozzle assembly as defined in  claim 1 , wherein in the high-pressure position the sealing pipe connection abuts on a sealing surface of the high-pressure nozzle surrounding the sealing pipe connection with an annular sealing section, said sealing section being expandable elastically due to an effect of a pressure of liquid conveyed and being pressed sealingly against the surrounding sealing surface. 
   
   
     9. Nozzle assembly as defined in  claim 8 , wherein the sealing section has a reduced wall thickness in comparison with a wall thickness of the spray lance. 
   
   
     10. Nozzle assembly as defined in  claim 8 , wherein the sealing section is cylindrical with a circular cross-section. 
   
   
     11. Nozzle assembly as defined in  claim 8 , wherein the sealing surface of the high-pressure nozzle is cylindrical with a circular cross-section. 
   
   
     12. Nozzle assembly as defined in  claim 11 , wherein a sealing area of the high-pressure nozzle which narrows in cross section adjoins the sealing surface of the high-pressure pressure nozzle in a direction downstream of a flow of liquid through the nozzle assembly. 
   
   
     13. Nozzle assembly as defined in  claim 8 , wherein the high-pressure nozzle has an elastic expandability in an area of the sealing surface which is considerably less than an elastic expandability of the sealing section of the spray lance. 
   
   
     14. Nozzle assembly as defined in  claim 13 , wherein in the area of the sealing surface the high-pressure nozzle has a wall thickness which is greater than a wall thickness of remaining wall areas of the high-pressure nozzle. 
   
   
     15. Nozzle assembly as defined in  claim 14 , wherein the high-pressure nozzle consists of one of a metal or a plastic with low elasticity at least in the area of the sealing surface. 
   
   
     16. Nozzle assembly as defined in  claim 13 , wherein the high-pressure nozzle consists of one of a metal or a plastic with low elasticity at least in the area of the sealing surface. 
   
   
     17. Nozzle assembly for a high-pressure cleaning device, comprising:
 a low-pressure nozzle, 
 a high-pressure nozzle arranged within the low pressure nozzle, 
 a spray lance having a first end adapted for connection to a supply line and a second end bearing a sealing pipe connection insertable into the high-pressure nozzle, 
 a bypass bypassing the high-pressure nozzle and leading to the low-pressure nozzle, 
 a pot-shaped housing arranged on the second end of the spray lance and surrounding the sealing pipe connection, and 
 displacement elements displaceable to alter the distance between the sealing pipe connection and the high-pressure nozzle to provide a high-pressure position in which the sealing pipe connection abuts sealingly on the high-pressure nozzle and interrupts a connection between the spray lance and the bypass and a low-pressure position in which the sealing pipe connection is at a distance from the high-pressure nozzle and establishes the connection between the spray lance and the bypass, 
 the low-pressure nozzle and the high-pressure nozzle being mounted in said pot-shaped housing so as to be freely displaceable and sealed in relation to an inner wall of the pot-shaped housing, 
 wherein: 
 the displacement elements displace the low-pressure nozzle and the high-pressure nozzle in the housing in a longitudinal direction of the housing towards the sealing pipe connection in the high-pressure position and away from the sealing pipe connection in the low-pressure position, 
 the high-pressure nozzle is pushable into an interior of the low-pressure nozzle from a rear side, 
 stop elements are provided, said stop elements limiting a depth of insertion of the high-pressure nozzle into the low-pressure nozzle, and 
 the high-pressure nozzle is secured against rotation about a longitudinal axis of the housing by means of an element preventing rotation. 
 
   
   
     18. Nozzle assembly for a high-pressure cleaning device, comprising:
 a low-pressure nozzle, 
 a high-pressure nozzle arranged within the low pressure nozzle, 
 a spray lance having a first end adapted for connection to a supply line and a second end bearing a sealing pipe connection insertable into the high-pressure nozzle, 
 a bypass bypassing the high-pressure nozzle and leading to the low-pressure nozzle, 
 a pot-shaped housing arranged on the second end of the spray lance and surrounding the sealing pipe connection, and 
 displacement elements displaceable to alter the distance between the sealing pipe connection and the high-pressure nozzle to provide a high-pressure position in which the sealing pipe connection abuts sealingly on the high-pressure nozzle and interrupts a connection between the spray lance and the bypass and a low-pressure position in which the sealing pipe connection is at a distance from the high-pressure nozzle and establishes the connection between the spray lance and the bypass, 
 the low-pressure nozzle and the high-pressure nozzle being mounted in said pot-shaped housing so as to be freely displaceable and sealed in relation to an inner wall of the pot-shaped housing, 
 wherein: 
 the displacement elements displace the low-pressure nozzle and the high-pressure nozzle in the housing in a longitudinal direction of the housing towards the sealing pipe connection in the high-pressure position and away from the sealing pipe connection in the low-pressure position, 
 in the high-pressure position the sealing pipe connection abuts on a sealing surface of the high-pressure nozzle surrounding the sealing pipe connection with an annular sealing section, said sealing section being expandable elastically due to an effect of a pressure of liquid conveyed and being pressed sealingly against the surrounding sealing surface, and 
 the sealing section at least consists of an elastically deformable plastic material. 
 
   
   
     19. Nozzle assembly as defined in  claim 18 , wherein:
 the high-pressure nozzle is pushable into an interior of the low-pressure nozzle from a rear side, and 
 stop elements are provided, said stop elements limiting a depth of insertion of the high-pressure nozzle into the low-pressure nozzle. 
 
   
   
     20. Nozzle assembly as defined in  claim 19 , wherein:
 the bypass comprises longitudinal channels formed between an inner wall of the interior of the low-pressure nozzle an outer wall of the inserted high-pressure nozzle. 
 
   
   
     21. Nozzle assembly as defined in  claim 18 , wherein the sealing section has a reduced wall thickness in comparison with a wall thickness of the spray lance. 
   
   
     22. Nozzle assembly as defined in  claim 18 , wherein the sealing section is cylindrical with a circular cross-section. 
   
   
     23. Nozzle assembly as defined in  claim 18 , wherein a sealing area of the high-pressure nozzle which narrows in cross section adjoins the sealing surface of the high-pressure nozzle in a direction downstream of a flow of liquid through the nozzle assembly. 
   
   
     24. Nozzle assembly as defined in  claim 18 , wherein the high-pressure nozzle has an elastic expandability in an area of the sealing surface which is considerably less than an elastic expandability of the sealing Section of the spray lance. 
   
   
     25. Nozzle assembly for a high-pressure cleaning device, comprising:
 a low-pressure nozzle, 
 a high-pressure nozzle arranged within the low pressure nozzle, 
 a spray lance having a first end adapted for connection to a supply line and a second end bearing a sealing pipe connection insertable into the high-pressure nozzle, 
 a bypass bypassing the high-pressure nozzle and leading to the low-vressure nozzle, 
 a pot-shaped housing arranged on the second end of the spray lance and surrounding the sealing pipe connection, and 
 displacement elements displaceable to alter the distance between the sealing pipe connection and the high-pressure nozzle to provide a high-pressure position in which the sealing pipe connection abuts sealingly on the high-pressure nozzle and interrupts a connection between the spray lance and the bypass and a low-pressure position in which the sealing pipe connection is at a distance from the high-pressure nozzle and establishes the connection between the spray lance and the bypass, 
 the low-pressure nozzle and the high-pressure nozzle being mounted in said pot-shaped housing so as to be freely displaceable and sealed in relation to an inner wall of the pot-shaped housing, 
 wherein: 
 the displacement elements displace the low-pressure nozzle and the high-pressure nozzle in the housing in a longitudinal direction of the housing towards the sealing pipe connection in the high-pressure position and away from the sealing pipe connection in the low-pressure position, 
 in the high-pressure position the sealing pipe connection abuts on a sealing surface of the high-pressure nozzle surrounding the sealing pipe connection with an annular sealing section, said sealing section being expandable elastically due to an effect of a pressure of liquid conveyed and being pressed sealingly against the surrounding sealing surface, and 
 a sealing area of the high-pressure nozzle which narrows in cross section adjoins the sealing surface of the high-pressure nozzle in a direction downstream of a flow of liquid through the nozzle assembly. 
 
   
   
     26. Nozzle assembly as defined in  claim 25 , wherein the sealing area narrowing in cross section is of a conical design.